Dont teachers often use this game to establish who the cheaters in class are? They watch carefully for open eyes, or the kid that never ever guesses wrong, and keep a close eye on them when it comes to testing and individual work.

-Cold day at school
-Wear gloves most of the day
-Heads up, seven up
-Six others picked to be "up" along with me
-Put on gloves, push down thumb, take off gloves and put them back in pocket
-Nobody the wiser
-Stay up for the entire game

To start the game, seven children are selected and come to the front of the room. The teacher (or selected player) says, "Heads down, thumbs up!" or "Heads down all around!". The children who are not selected then put their heads down, close their eyes, and put up one thumb each. The chosen seven circulate through the room, secretly pressing down one thumb each and then returning to the front of the room. A variation is simply tapping the person. This part of the game takes about one minute.
The teacher/selected player then calls, "Heads up, seven up!" or "Heads up, stand up!" All children raise their heads and the seven whose thumbs were pressed stand up. Each in turn names the person they think pressed their thumb. If they are correct, the thumb-presser sits down and the winning child takes their place. The game then starts again.